This was an actual mistake in the argument order. Similar errors in mypy_snapshot.out where false positives due to a mypy bug fixed in v0.650, https://github.com/python/mypy/issues/5681. I was using v0.641 to generate the snapshot but Travis used v0.670. Thus the mypy check outcome can be enabled in tox.
This was an actual mistake in the argument order. Similar errors in
mypy_snapshot.outwhere false positives due to a mypy bug fixed in v0.650, https://github.com/python/mypy/issues/5681. I was using v0.641 to generate the snapshot but Travis used v0.670. Thus the mypy check outcome can be enabled in tox.